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Top Forums Shell Programming and Scripting Bash $(...) DISPLAYS EVERY COMMAND
# 1  
Old 02-01-2016

I use things like this a lot in ksh and bash, but lately bash has been printing the command for every loop:
... | while read f
if [ "$(cmp $f xx/$f 2>&1)" = "" ]
 echo Differ "$f"

How to prevent this?
# 2  
Old 02-01-2016
Hints: -x or -v as arguments to the shell

So... perhaps you didn't mean to have those arguments set... so it's possible the shell is defaulting to this elsewhere. Or perhaps somebody did something like a "set -x" from the command line. So you can try doing "set -" (set dash) to see if that fixes things.
# 3  
Old 02-01-2016
No, this just applies to the subshell of the (...). Here is another example, with first page of screen output:
$ (cd GnuCash ; find * -type f|while read f; do  fi [ ! -s ~/GnuCash2/"$f" ]thencp -p "$f" ~/GnuCash2/"$f";continuefid="$(cmp "$f" ~/GnuCash2/"$f" 2>&1)";  if [ "$d" != "" ];  then   echo Differ: "$d";ls -ld "$f" ~/GnuCash2/"$f";  fi; done)2>&1|pg

cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
Differ: ubuntu-DGPickett.gnucash /home/dgp/GnuCash2/ubuntu-DGPickett.gnucash differ: byte 13, line 1
-rw-rw-r-- 1 dgp dgp 1345098 Jan 30 15:04 /home/dgp/GnuCash2/ubuntu-DGPickett.gnucash
-rw-rw-r-- 1 dgp dgp 1347820 Feb  1 13:12 ubuntu-DGPickett.gnucash
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1
cmp "$f" ~/GnuCash2/"$f" 2>&1

You can see it is a pretty worthless thing to do, too!
# 4  
Old 02-01-2016
Lots of typos in what you had... just to make sure, could you either edit your post or submit correction to clean things up a bit?
# 5  
Old 02-01-2016
Originally Posted by cjcox
so it's possible the shell is defaulting to this elsewhere.
I second this. If i remember correctly bash first reads the /etc/bashrc and only then the rc-file in the own $HOME. Might it be that somehow the subshells only use one of these and hence operate with a different configureation than your login shell(s)?

I hope this helps.

# 6  
Old 02-01-2016
shopt -q

builtin lets you test which options are in effect. Read this discussion which is too long for display here.

....Instead of shooting in the dark. Then you can eliminate set -[some option ] as a problem
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